WebSVN – HelenOS – Diff – /branches/tracing/uspace/lib/libc/generic/vfs/vfs.c


/*
 * Copyright (c) 2008 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
/** @addtogroup libc
 * @{
 */
/** @file
 */
 
#include <vfs/vfs.h>
#include <vfs/canonify.h>
#include <stdlib.h>
#include <unistd.h>
#include <dirent.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <stdio.h>
#include <sys/types.h>
#include <ipc/ipc.h>
#include <ipc/services.h>
#include <async.h>
#include <atomic.h>
#include <futex.h>
#include <errno.h>
#include <string.h>
#include <ipc/devmap.h>
#include "../../srv/vfs/vfs.h"
 
int vfs_phone = -1;
futex_t vfs_phone_futex = FUTEX_INITIALIZER;
 
futex_t cwd_futex = FUTEX_INITIALIZER;
DIR *cwd_dir = NULL;
char *cwd_path = NULL;
size_t cwd_len = 0;
 
char *absolutize(const char *path, size_t *retlen)
{
    char *ncwd_path;
    char *ncwd_path_nc;
 
    futex_down(&cwd_futex);
    size_t len = strlen(path);
    if (*path != '/') {
        if (!cwd_path) {
            futex_up(&cwd_futex);
            return NULL;
        }
        ncwd_path_nc = malloc(cwd_len + 1 + len + 1);
        if (!ncwd_path_nc) {
            futex_up(&cwd_futex);
            return NULL;
        }
        strcpy(ncwd_path_nc, cwd_path);
        ncwd_path_nc[cwd_len] = '/';
        ncwd_path_nc[cwd_len + 1] = '\0';
    } else {
        ncwd_path_nc = malloc(len + 1);
        if (!ncwd_path_nc) {
            futex_up(&cwd_futex);
            return NULL;
        }
        ncwd_path_nc[0] = '\0';
    }
    strcat(ncwd_path_nc, path);
    ncwd_path = canonify(ncwd_path_nc, retlen);
    if (!ncwd_path) {
        futex_up(&cwd_futex);
        free(ncwd_path_nc);
        return NULL;
    }
    /*
     * We need to clone ncwd_path because canonify() works in-place and thus
     * the address in ncwd_path need not be the same as ncwd_path_nc, even
     * though they both point into the same dynamically allocated buffer.
     */
    ncwd_path = strdup(ncwd_path);
    free(ncwd_path_nc);
    if (!ncwd_path) {
        futex_up(&cwd_futex);
 
        return NULL;
    }
    futex_up(&cwd_futex);
    return ncwd_path;
}
 
static int vfs_connect(void)
{
    if (vfs_phone < 0)
        vfs_phone = ipc_connect_me_to(PHONE_NS, SERVICE_VFS, 0, 0);
    return vfs_phone;
}
 
static int device_get_handle(char *name, dev_handle_t *handle)
{
    int phone = ipc_connect_me_to(PHONE_NS, SERVICE_DEVMAP, DEVMAP_CLIENT,
        0);
    if (phone < 0)
        return phone;
   
    ipc_call_t answer;
    aid_t req = async_send_2(phone, DEVMAP_DEVICE_GET_HANDLE, 0, 0,
        &answer);
   
    ipcarg_t retval = ipc_data_write_start(phone, name, strlen(name) + 1);
 
    if (retval != EOK) {
        async_wait_for(req, NULL);
        ipc_hangup(phone);
        return retval;
    }
 
    async_wait_for(req, &retval);
 
    if (handle != NULL)
        *handle = -1;
   
    if (retval == EOK) {
        if (handle != NULL)
            *handle = (dev_handle_t) IPC_GET_ARG1(answer);
    }
   
    ipc_hangup(phone);
    return retval;
}
 
int mount(const char *fs_name, const char *mp, const char *dev)
{
    int res;
    ipcarg_t rc;
    aid_t req;
    dev_handle_t dev_handle;
   
    res = device_get_handle(dev, &dev_handle);
    if (res != EOK)
        return res;
   
    size_t mpa_len;
    char *mpa = absolutize(mp, &mpa_len);
    if (!mpa)
        return ENOMEM;
 
    futex_down(&vfs_phone_futex);
    async_serialize_start();
    if (vfs_phone < 0) {
        res = vfs_connect();
        if (res < 0) {
            async_serialize_end();
            futex_up(&vfs_phone_futex);
            free(mpa);
            return res;
        }
    }
    req = async_send_1(vfs_phone, VFS_MOUNT, dev_handle, NULL);
    rc = ipc_data_write_start(vfs_phone, (void *)fs_name, strlen(fs_name));
    if (rc != EOK) {
        async_wait_for(req, NULL);
        async_serialize_end();
        futex_up(&vfs_phone_futex);
        free(mpa);
        return (int) rc;
    }
    /* Ask VFS whether it likes fs_name. */
    rc = async_req_0_0(vfs_phone, IPC_M_PING);
    if (rc != EOK) {
        async_wait_for(req, NULL);
        async_serialize_end();
        futex_up(&vfs_phone_futex);
        free(mpa);
        return (int) rc;
    }
    rc = ipc_data_write_start(vfs_phone, (void *)mpa, mpa_len);
    if (rc != EOK) {
        async_wait_for(req, NULL);
        async_serialize_end();
        futex_up(&vfs_phone_futex);
        free(mpa);
        return (int) rc;
    }
    async_wait_for(req, &rc);
    async_serialize_end();
    futex_up(&vfs_phone_futex);
    free(mpa);
    return (int) rc;
}
 
static int _open(const char *path, int lflag, int oflag, ...)
{
    int res;
    ipcarg_t rc;
    ipc_call_t answer;
    aid_t req;
   
    size_t pa_len;
    char *pa = absolutize(path, &pa_len);
    if (!pa)
        return ENOMEM;
   
    futex_down(&vfs_phone_futex);
    async_serialize_start();
    if (vfs_phone < 0) {
        res = vfs_connect();
        if (res < 0) {
            async_serialize_end();
            futex_up(&vfs_phone_futex);
            free(pa);
            return res;
        }
    }
    req = async_send_3(vfs_phone, VFS_OPEN, lflag, oflag, 0, &answer);
    rc = ipc_data_write_start(vfs_phone, pa, pa_len);
    if (rc != EOK) {
        async_wait_for(req, NULL);
        async_serialize_end();
        futex_up(&vfs_phone_futex);
        free(pa);
        return (int) rc;
    }
    async_wait_for(req, &rc);
    async_serialize_end();
    futex_up(&vfs_phone_futex);
    free(pa);
 
    if (rc != EOK)
        return (int) rc;
    return (int) IPC_GET_ARG1(answer);
}
 
int open(const char *path, int oflag, ...)
{
    return _open(path, L_FILE, oflag);
}
 
int close(int fildes)
{
    int res;
    ipcarg_t rc;
 
    futex_down(&vfs_phone_futex);
    async_serialize_start();
    if (vfs_phone < 0) {
        res = vfs_connect();
        if (res < 0) {
            async_serialize_end();
            futex_up(&vfs_phone_futex);
            return res;
        }
    }
       
    rc = async_req_1_0(vfs_phone, VFS_CLOSE, fildes);
 
    async_serialize_end();
    futex_up(&vfs_phone_futex);
   
    return (int)rc;
}
 
ssize_t read(int fildes, void *buf, size_t nbyte)
{
    int res;
    ipcarg_t rc;
    ipc_call_t answer;
    aid_t req;
 
    futex_down(&vfs_phone_futex);
    async_serialize_start();
    if (vfs_phone < 0) {
        res = vfs_connect();
        if (res < 0) {
            async_serialize_end();
            futex_up(&vfs_phone_futex);
            return res;
        }
    }
    req = async_send_1(vfs_phone, VFS_READ, fildes, &answer);
    rc = ipc_data_read_start(vfs_phone, (void *)buf, nbyte);
    if (rc != EOK) {
        async_wait_for(req, NULL);
        async_serialize_end();
        futex_up(&vfs_phone_futex);
        return (ssize_t) rc;
    }
    async_wait_for(req, &rc);
    async_serialize_end();
    futex_up(&vfs_phone_futex);
    if (rc == EOK)
        return (ssize_t) IPC_GET_ARG1(answer);
    else
        return rc;
}
 
ssize_t write(int fildes, const void *buf, size_t nbyte)
{
    int res;
    ipcarg_t rc;
    ipc_call_t answer;
    aid_t req;
 
    futex_down(&vfs_phone_futex);
    async_serialize_start();
    if (vfs_phone < 0) {
        res = vfs_connect();
        if (res < 0) {
            async_serialize_end();
            futex_up(&vfs_phone_futex);
            return res;
        }
    }
    req = async_send_1(vfs_phone, VFS_WRITE, fildes, &answer);
    rc = ipc_data_write_start(vfs_phone, (void *)buf, nbyte);
    if (rc != EOK) {
        async_wait_for(req, NULL);
        async_serialize_end();
        futex_up(&vfs_phone_futex);
        return (ssize_t) rc;
    }
    async_wait_for(req, &rc);
    async_serialize_end();
    futex_up(&vfs_phone_futex);
    if (rc == EOK)
        return (ssize_t) IPC_GET_ARG1(answer);
    else
        return -1;
}
 
off_t lseek(int fildes, off_t offset, int whence)
{
    int res;
    ipcarg_t rc;
 
    futex_down(&vfs_phone_futex);
    async_serialize_start();
    if (vfs_phone < 0) {
        res = vfs_connect();
        if (res < 0) {
            async_serialize_end();
            futex_up(&vfs_phone_futex);
            return res;
        }
    }
       
    off_t newoffs;
    rc = async_req_3_1(vfs_phone, VFS_SEEK, fildes, offset, whence,
        (ipcarg_t)&newoffs);
 
    async_serialize_end();
    futex_up(&vfs_phone_futex);
 
    if (rc != EOK)
        return (off_t) -1;
   
    return newoffs;
}
 
int ftruncate(int fildes, off_t length)
{
    int res;
    ipcarg_t rc;
   
    futex_down(&vfs_phone_futex);
    async_serialize_start();
    if (vfs_phone < 0) {
        res = vfs_connect();
        if (res < 0) {
            async_serialize_end();
            futex_up(&vfs_phone_futex);
            return res;
        }
    }
    rc = async_req_2_0(vfs_phone, VFS_TRUNCATE, fildes, length);
    async_serialize_end();
    futex_up(&vfs_phone_futex);
    return (int) rc;
}
 
DIR *opendir(const char *dirname)
{
    DIR *dirp = malloc(sizeof(DIR));
    if (!dirp)
        return NULL;
    dirp->fd = _open(dirname, L_DIRECTORY, 0);
    if (dirp->fd < 0) {
        free(dirp);
        return NULL;
    }
    return dirp;
}
 
struct dirent *readdir(DIR *dirp)
{
    ssize_t len = read(dirp->fd, &dirp->res.d_name[0], NAME_MAX + 1);
    if (len <= 0)
        return NULL;
    return &dirp->res;
}
 
void rewinddir(DIR *dirp)
{
    (void) lseek(dirp->fd, 0, SEEK_SET);
}
 
int closedir(DIR *dirp)
{
    (void) close(dirp->fd);
    free(dirp);
    return 0;
}
 
int mkdir(const char *path, mode_t mode)
{
    int res;
    ipcarg_t rc;
    aid_t req;
   
    size_t pa_len;
    char *pa = absolutize(path, &pa_len);
    if (!pa)
        return ENOMEM;
 
    futex_down(&vfs_phone_futex);
    async_serialize_start();
    if (vfs_phone < 0) {
        res = vfs_connect();
        if (res < 0) {
            async_serialize_end();
            futex_up(&vfs_phone_futex);
            free(pa);
            return res;
        }
    }
    req = async_send_1(vfs_phone, VFS_MKDIR, mode, NULL);
    rc = ipc_data_write_start(vfs_phone, pa, pa_len);
    if (rc != EOK) {
        async_wait_for(req, NULL);
        async_serialize_end();
        futex_up(&vfs_phone_futex);
        free(pa);
        return (int) rc;
    }
    async_wait_for(req, &rc);
    async_serialize_end();
    futex_up(&vfs_phone_futex);
    free(pa);
    return rc;
}
 
static int _unlink(const char *path, int lflag)
{
    int res;
    ipcarg_t rc;
    aid_t req;
   
    size_t pa_len;
    char *pa = absolutize(path, &pa_len);
    if (!pa)
        return ENOMEM;
 
    futex_down(&vfs_phone_futex);
    async_serialize_start();
    if (vfs_phone < 0) {
        res = vfs_connect();
        if (res < 0) {
            async_serialize_end();
            futex_up(&vfs_phone_futex);
            free(pa);
            return res;
        }
    }
    req = async_send_0(vfs_phone, VFS_UNLINK, NULL);
    rc = ipc_data_write_start(vfs_phone, pa, pa_len);
    if (rc != EOK) {
        async_wait_for(req, NULL);
        async_serialize_end();
        futex_up(&vfs_phone_futex);
        free(pa);
        return (int) rc;
    }
    async_wait_for(req, &rc);
    async_serialize_end();
    futex_up(&vfs_phone_futex);
    free(pa);
    return rc;
}
 
int unlink(const char *path)
{
    return _unlink(path, L_NONE);
}
 
int rmdir(const char *path)
{
    return _unlink(path, L_DIRECTORY);
}
 
int rename(const char *old, const char *new)
{
    int res;
    ipcarg_t rc;
    aid_t req;
   
    size_t olda_len;
    char *olda = absolutize(old, &olda_len);
    if (!olda)
        return ENOMEM;
 
    size_t newa_len;
    char *newa = absolutize(new, &newa_len);
    if (!newa) {
        free(olda);
        return ENOMEM;
    }
 
    futex_down(&vfs_phone_futex);
    async_serialize_start();
    if (vfs_phone < 0) {
        res = vfs_connect();
        if (res < 0) {
            async_serialize_end();
            futex_up(&vfs_phone_futex);
            free(olda);
            free(newa);
            return res;
        }
    }
    req = async_send_0(vfs_phone, VFS_RENAME, NULL);
    rc = ipc_data_write_start(vfs_phone, olda, olda_len);
    if (rc != EOK) {
        async_wait_for(req, NULL);
        async_serialize_end();
        futex_up(&vfs_phone_futex);
        free(olda);
        free(newa);
        return (int) rc;
    }
    rc = ipc_data_write_start(vfs_phone, newa, newa_len);
    if (rc != EOK) {
        async_wait_for(req, NULL);
        async_serialize_end();
        futex_up(&vfs_phone_futex);
        free(olda);
        free(newa);
        return (int) rc;
    }
    async_wait_for(req, &rc);
    async_serialize_end();
    futex_up(&vfs_phone_futex);
    free(olda);
    free(newa);
    return rc;
}
 
int chdir(const char *path)
{
    size_t pa_len;
    char *pa = absolutize(path, &pa_len);
    if (!pa)
        return ENOMEM;
 
    DIR *d = opendir(pa);
    if (!d) {
        free(pa);
        return ENOENT;
    }
 
    futex_down(&cwd_futex);
    if (cwd_dir) {
        closedir(cwd_dir);
        cwd_dir = NULL;
        free(cwd_path);
        cwd_path = NULL;
        cwd_len = 0;
    }
    cwd_dir = d;
    cwd_path = pa;
    cwd_len = pa_len;
    futex_up(&cwd_futex);
}
 
char *getcwd(char *buf, size_t size)
{
    if (!size)
        return NULL;
    futex_down(&cwd_futex);
    if (size < cwd_len + 1) {
        futex_up(&cwd_futex);
        return NULL;
    }
    strcpy(buf, cwd_path);
    futex_up(&cwd_futex);
    return buf;
}
 
/** @}
 */
 

Rev 3424	Rev 3425
1	/*	1	/*
2	* Copyright (c) 2008 Jakub Jermar	2	* Copyright (c) 2008 Jakub Jermar
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	13	* documentation and/or other materials provided with the distribution.
14	* - The name of the author may not be used to endorse or promote products	14	* - The name of the author may not be used to endorse or promote products
15	* derived from this software without specific prior written permission.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
29	/** @addtogroup libc	29	/** @addtogroup libc
30	* @{	30	* @{
31	*/	31	*/
32	/** @file	32	/** @file
33	*/	33	*/
34		34
35	#include <vfs/vfs.h>	35	#include <vfs/vfs.h>
36	#include <vfs/canonify.h>	36	#include <vfs/canonify.h>
37	#include <stdlib.h>	37	#include <stdlib.h>
38	#include <unistd.h>	38	#include <unistd.h>
39	#include <dirent.h>	39	#include <dirent.h>
40	#include <fcntl.h>	40	#include <fcntl.h>
41	#include <sys/stat.h>	41	#include <sys/stat.h>
42	#include <stdio.h>	42	#include <stdio.h>
43	#include <sys/types.h>	43	#include <sys/types.h>
44	#include <ipc/ipc.h>	44	#include <ipc/ipc.h>
45	#include <ipc/services.h>	45	#include <ipc/services.h>
46	#include <async.h>	46	#include <async.h>
47	#include <atomic.h>	47	#include <atomic.h>
48	#include <futex.h>	48	#include <futex.h>
49	#include <errno.h>	49	#include <errno.h>
50	#include <string.h>	50	#include <string.h>
51	#include <ipc/devmap.h>	51	#include <ipc/devmap.h>
52	#include "../../srv/vfs/vfs.h"	52	#include "../../srv/vfs/vfs.h"
53		53
54	int vfs_phone = -1;	54	int vfs_phone = -1;
55	futex_t vfs_phone_futex = FUTEX_INITIALIZER;	55	futex_t vfs_phone_futex = FUTEX_INITIALIZER;
56		56
57	futex_t cwd_futex = FUTEX_INITIALIZER;	57	futex_t cwd_futex = FUTEX_INITIALIZER;
58	DIR *cwd_dir = NULL;	58	DIR *cwd_dir = NULL;
59	char *cwd_path = NULL;	59	char *cwd_path = NULL;
60	size_t cwd_len = 0;	60	size_t cwd_len = 0;
61		61
62	static char absolutize(const char path, size_t *retlen)	62	char absolutize(const char path, size_t *retlen)
63	{	63	{
64	char *ncwd_path;	64	char *ncwd_path;
-		65	char *ncwd_path_nc;
65		66
66	futex_down(&cwd_futex);	67	futex_down(&cwd_futex);
67	size_t len = strlen(path);	68	size_t len = strlen(path);
68	if (*path != '/') {	69	if (*path != '/') {
69	if (!cwd_path) {	70	if (!cwd_path) {
70	futex_up(&cwd_futex);	71	futex_up(&cwd_futex);
71	return NULL;	72	return NULL;
72	}	73	}
73	ncwd_path = malloc(len + cwd_len + 1);	74	ncwd_path_nc = malloc(cwd_len + 1 + len + 1);
74	if (!ncwd_path) {	75	if (!ncwd_path_nc) {
75	futex_up(&cwd_futex);	76	futex_up(&cwd_futex);
76	return NULL;	77	return NULL;
77	}	78	}
78	strcpy(ncwd_path, cwd_path);	79	strcpy(ncwd_path_nc, cwd_path);
79	ncwd_path[cwd_len] = '/';	80	ncwd_path_nc[cwd_len] = '/';
80	ncwd_path[cwd_len + 1] = '\0';	81	ncwd_path_nc[cwd_len + 1] = '\0';
81	} else {	82	} else {
82	ncwd_path = malloc(len + 1);	83	ncwd_path_nc = malloc(len + 1);
83	if (!ncwd_path) {	84	if (!ncwd_path_nc) {
84	futex_up(&cwd_futex);	85	futex_up(&cwd_futex);
85	return NULL;	86	return NULL;
86	}	87	}
87	ncwd_path[0] = '\0';	88	ncwd_path_nc[0] = '\0';
88	}	89	}
89	strcat(ncwd_path, path);	90	strcat(ncwd_path_nc, path);
90	if (!canonify(ncwd_path, retlen)) {	91	ncwd_path = canonify(ncwd_path_nc, retlen);
-		92	if (!ncwd_path) {
-		93	futex_up(&cwd_futex);
-		94	free(ncwd_path_nc);
-		95	return NULL;
-		96	}
-		97	/*
-		98	* We need to clone ncwd_path because canonify() works in-place and thus
-		99	* the address in ncwd_path need not be the same as ncwd_path_nc, even
-		100	* though they both point into the same dynamically allocated buffer.
-		101	*/
-		102	ncwd_path = strdup(ncwd_path);
-		103	free(ncwd_path_nc);
-		104	if (!ncwd_path) {
91	futex_up(&cwd_futex);	105	futex_up(&cwd_futex);
92	free(ncwd_path);	-
93	return NULL;	106	return NULL;
94	}	107	}
95	futex_up(&cwd_futex);	108	futex_up(&cwd_futex);
96	return ncwd_path;	109	return ncwd_path;
97	}	110	}
98		111
99	static int vfs_connect(void)	112	static int vfs_connect(void)
100	{	113	{
101	if (vfs_phone < 0)	114	if (vfs_phone < 0)
102	vfs_phone = ipc_connect_me_to(PHONE_NS, SERVICE_VFS, 0, 0);	115	vfs_phone = ipc_connect_me_to(PHONE_NS, SERVICE_VFS, 0, 0);
103	return vfs_phone;	116	return vfs_phone;
104	}	117	}
105		118
106	static int device_get_handle(char name, dev_handle_t handle)	119	static int device_get_handle(char name, dev_handle_t handle)
107	{	120	{
108	int phone = ipc_connect_me_to(PHONE_NS, SERVICE_DEVMAP, DEVMAP_CLIENT, 0);	121	int phone = ipc_connect_me_to(PHONE_NS, SERVICE_DEVMAP, DEVMAP_CLIENT,
-		122	0);
109	if (phone < 0)	123	if (phone < 0)
110	return phone;	124	return phone;
111		125
112	ipc_call_t answer;	126	ipc_call_t answer;
113	aid_t req = async_send_2(phone, DEVMAP_DEVICE_GET_HANDLE, 0, 0,	127	aid_t req = async_send_2(phone, DEVMAP_DEVICE_GET_HANDLE, 0, 0,
114	&answer);	128	&answer);
115		129
116	ipcarg_t retval = ipc_data_write_start(phone, name, strlen(name) + 1);	130	ipcarg_t retval = ipc_data_write_start(phone, name, strlen(name) + 1);
117		131
118	if (retval != EOK) {	132	if (retval != EOK) {
119	async_wait_for(req, NULL);	133	async_wait_for(req, NULL);
120	ipc_hangup(phone);	134	ipc_hangup(phone);
121	return retval;	135	return retval;
122	}	136	}
123		137
124	async_wait_for(req, &retval);	138	async_wait_for(req, &retval);
125		139
126	if (handle != NULL)	140	if (handle != NULL)
127	*handle = -1;	141	*handle = -1;
128		142
129	if (retval == EOK) {	143	if (retval == EOK) {
130	if (handle != NULL)	144	if (handle != NULL)
131	*handle = (dev_handle_t) IPC_GET_ARG1(answer);	145	*handle = (dev_handle_t) IPC_GET_ARG1(answer);
132	}	146	}
133		147
134	ipc_hangup(phone);	148	ipc_hangup(phone);
135	return retval;	149	return retval;
136	}	150	}
137		151
138	int mount(const char fs_name, const char mp, const char *dev)	152	int mount(const char fs_name, const char mp, const char *dev)
139	{	153	{
140	int res;	154	int res;
141	ipcarg_t rc;	155	ipcarg_t rc;
142	aid_t req;	156	aid_t req;
143	dev_handle_t dev_handle;	157	dev_handle_t dev_handle;
144		158
145	res = device_get_handle(dev, &dev_handle);	159	res = device_get_handle(dev, &dev_handle);
146	if (res != EOK)	160	if (res != EOK)
147	return res;	161	return res;
148		162
149	size_t mpa_len;	163	size_t mpa_len;
150	char *mpa = absolutize(mp, &mpa_len);	164	char *mpa = absolutize(mp, &mpa_len);
151	if (!mpa)	165	if (!mpa)
152	return ENOMEM;	166	return ENOMEM;
153		167
154	futex_down(&vfs_phone_futex);	168	futex_down(&vfs_phone_futex);
155	async_serialize_start();	169	async_serialize_start();
156	if (vfs_phone < 0) {	170	if (vfs_phone < 0) {
157	res = vfs_connect();	171	res = vfs_connect();
158	if (res < 0) {	172	if (res < 0) {
159	async_serialize_end();	173	async_serialize_end();
160	futex_up(&vfs_phone_futex);	174	futex_up(&vfs_phone_futex);
161	free(mpa);	175	free(mpa);
162	return res;	176	return res;
163	}	177	}
164	}	178	}
165	req = async_send_1(vfs_phone, VFS_MOUNT, dev_handle, NULL);	179	req = async_send_1(vfs_phone, VFS_MOUNT, dev_handle, NULL);
166	rc = ipc_data_write_start(vfs_phone, (void *)fs_name, strlen(fs_name));	180	rc = ipc_data_write_start(vfs_phone, (void *)fs_name, strlen(fs_name));
167	if (rc != EOK) {	181	if (rc != EOK) {
168	async_wait_for(req, NULL);	182	async_wait_for(req, NULL);
169	async_serialize_end();	183	async_serialize_end();
170	futex_up(&vfs_phone_futex);	184	futex_up(&vfs_phone_futex);
171	free(mpa);	185	free(mpa);
172	return (int) rc;	186	return (int) rc;
173	}	187	}
-		188	/* Ask VFS whether it likes fs_name. */
-		189	rc = async_req_0_0(vfs_phone, IPC_M_PING);
-		190	if (rc != EOK) {
-		191	async_wait_for(req, NULL);
-		192	async_serialize_end();
-		193	futex_up(&vfs_phone_futex);
-		194	free(mpa);
-		195	return (int) rc;
-		196	}
174	rc = ipc_data_write_start(vfs_phone, (void *)mpa, mpa_len);	197	rc = ipc_data_write_start(vfs_phone, (void *)mpa, mpa_len);
175	if (rc != EOK) {	198	if (rc != EOK) {
176	async_wait_for(req, NULL);	199	async_wait_for(req, NULL);
177	async_serialize_end();	200	async_serialize_end();
178	futex_up(&vfs_phone_futex);	201	futex_up(&vfs_phone_futex);
179	free(mpa);	202	free(mpa);
180	return (int) rc;	203	return (int) rc;
181	}	204	}
182	async_wait_for(req, &rc);	205	async_wait_for(req, &rc);
183	async_serialize_end();	206	async_serialize_end();
184	futex_up(&vfs_phone_futex);	207	futex_up(&vfs_phone_futex);
185	free(mpa);	208	free(mpa);
186	return (int) rc;	209	return (int) rc;
187	}	210	}
188		211
189	static int _open(const char *path, int lflag, int oflag, ...)	212	static int _open(const char *path, int lflag, int oflag, ...)
190	{	213	{
191	int res;	214	int res;
192	ipcarg_t rc;	215	ipcarg_t rc;
193	ipc_call_t answer;	216	ipc_call_t answer;
194	aid_t req;	217	aid_t req;
195		218
196	size_t pa_len;	219	size_t pa_len;
197	char *pa = absolutize(path, &pa_len);	220	char *pa = absolutize(path, &pa_len);
198	if (!pa)	221	if (!pa)
199	return ENOMEM;	222	return ENOMEM;
200		223
201	futex_down(&vfs_phone_futex);	224	futex_down(&vfs_phone_futex);
202	async_serialize_start();	225	async_serialize_start();
203	if (vfs_phone < 0) {	226	if (vfs_phone < 0) {
204	res = vfs_connect();	227	res = vfs_connect();
205	if (res < 0) {	228	if (res < 0) {
206	async_serialize_end();	229	async_serialize_end();
207	futex_up(&vfs_phone_futex);	230	futex_up(&vfs_phone_futex);
208	free(pa);	231	free(pa);
209	return res;	232	return res;
210	}	233	}
211	}	234	}
212	req = async_send_3(vfs_phone, VFS_OPEN, lflag, oflag, 0, &answer);	235	req = async_send_3(vfs_phone, VFS_OPEN, lflag, oflag, 0, &answer);
213	rc = ipc_data_write_start(vfs_phone, pa, pa_len);	236	rc = ipc_data_write_start(vfs_phone, pa, pa_len);
214	if (rc != EOK) {	237	if (rc != EOK) {
215	async_wait_for(req, NULL);	238	async_wait_for(req, NULL);
216	async_serialize_end();	239	async_serialize_end();
217	futex_up(&vfs_phone_futex);	240	futex_up(&vfs_phone_futex);
218	free(pa);	241	free(pa);
219	return (int) rc;	242	return (int) rc;
220	}	243	}
221	async_wait_for(req, &rc);	244	async_wait_for(req, &rc);
222	async_serialize_end();	245	async_serialize_end();
223	futex_up(&vfs_phone_futex);	246	futex_up(&vfs_phone_futex);
224	free(pa);	247	free(pa);
-		248
-		249	if (rc != EOK)
-		250	return (int) rc;
225	return (int) IPC_GET_ARG1(answer);	251	return (int) IPC_GET_ARG1(answer);
226	}	252	}
227		253
228	int open(const char *path, int oflag, ...)	254	int open(const char *path, int oflag, ...)
229	{	255	{
230	return _open(path, L_FILE, oflag);	256	return _open(path, L_FILE, oflag);
231	}	257	}
232		258
233	int close(int fildes)	259	int close(int fildes)
234	{	260	{
235	int res;	261	int res;
236	ipcarg_t rc;	262	ipcarg_t rc;
237		263
238	futex_down(&vfs_phone_futex);	264	futex_down(&vfs_phone_futex);
239	async_serialize_start();	265	async_serialize_start();
240	if (vfs_phone < 0) {	266	if (vfs_phone < 0) {
241	res = vfs_connect();	267	res = vfs_connect();
242	if (res < 0) {	268	if (res < 0) {
243	async_serialize_end();	269	async_serialize_end();
244	futex_up(&vfs_phone_futex);	270	futex_up(&vfs_phone_futex);
245	return res;	271	return res;
246	}	272	}
247	}	273	}
248		274
249	rc = async_req_1_0(vfs_phone, VFS_CLOSE, fildes);	275	rc = async_req_1_0(vfs_phone, VFS_CLOSE, fildes);
250		276
251	async_serialize_end();	277	async_serialize_end();
252	futex_up(&vfs_phone_futex);	278	futex_up(&vfs_phone_futex);
253		279
254	return (int)rc;	280	return (int)rc;
255	}	281	}
256		282
257	ssize_t read(int fildes, void *buf, size_t nbyte)	283	ssize_t read(int fildes, void *buf, size_t nbyte)
258	{	284	{
259	int res;	285	int res;
260	ipcarg_t rc;	286	ipcarg_t rc;
261	ipc_call_t answer;	287	ipc_call_t answer;
262	aid_t req;	288	aid_t req;
263		289
264	futex_down(&vfs_phone_futex);	290	futex_down(&vfs_phone_futex);
265	async_serialize_start();	291	async_serialize_start();
266	if (vfs_phone < 0) {	292	if (vfs_phone < 0) {
267	res = vfs_connect();	293	res = vfs_connect();
268	if (res < 0) {	294	if (res < 0) {
269	async_serialize_end();	295	async_serialize_end();
270	futex_up(&vfs_phone_futex);	296	futex_up(&vfs_phone_futex);
271	return res;	297	return res;
272	}	298	}
273	}	299	}
274	req = async_send_1(vfs_phone, VFS_READ, fildes, &answer);	300	req = async_send_1(vfs_phone, VFS_READ, fildes, &answer);
275	rc = ipc_data_read_start(vfs_phone, (void *)buf, nbyte);	301	rc = ipc_data_read_start(vfs_phone, (void *)buf, nbyte);
276	if (rc != EOK) {	302	if (rc != EOK) {
277	async_wait_for(req, NULL);	303	async_wait_for(req, NULL);
278	async_serialize_end();	304	async_serialize_end();
279	futex_up(&vfs_phone_futex);	305	futex_up(&vfs_phone_futex);
280	return (ssize_t) rc;	306	return (ssize_t) rc;
281	}	307	}
282	async_wait_for(req, &rc);	308	async_wait_for(req, &rc);
283	async_serialize_end();	309	async_serialize_end();
284	futex_up(&vfs_phone_futex);	310	futex_up(&vfs_phone_futex);
285	if (rc == EOK)	311	if (rc == EOK)
286	return (ssize_t) IPC_GET_ARG1(answer);	312	return (ssize_t) IPC_GET_ARG1(answer);
287	else	313	else
288	return -1;	314	return rc;
289	}	315	}
290		316
291	ssize_t write(int fildes, const void *buf, size_t nbyte)	317	ssize_t write(int fildes, const void *buf, size_t nbyte)
292	{	318	{
293	int res;	319	int res;
294	ipcarg_t rc;	320	ipcarg_t rc;
295	ipc_call_t answer;	321	ipc_call_t answer;
296	aid_t req;	322	aid_t req;
297		323
298	futex_down(&vfs_phone_futex);	324	futex_down(&vfs_phone_futex);
299	async_serialize_start();	325	async_serialize_start();
300	if (vfs_phone < 0) {	326	if (vfs_phone < 0) {
301	res = vfs_connect();	327	res = vfs_connect();
302	if (res < 0) {	328	if (res < 0) {
303	async_serialize_end();	329	async_serialize_end();
304	futex_up(&vfs_phone_futex);	330	futex_up(&vfs_phone_futex);
305	return res;	331	return res;
306	}	332	}
307	}	333	}
308	req = async_send_1(vfs_phone, VFS_WRITE, fildes, &answer);	334	req = async_send_1(vfs_phone, VFS_WRITE, fildes, &answer);
309	rc = ipc_data_write_start(vfs_phone, (void *)buf, nbyte);	335	rc = ipc_data_write_start(vfs_phone, (void *)buf, nbyte);
310	if (rc != EOK) {	336	if (rc != EOK) {
311	async_wait_for(req, NULL);	337	async_wait_for(req, NULL);
312	async_serialize_end();	338	async_serialize_end();
313	futex_up(&vfs_phone_futex);	339	futex_up(&vfs_phone_futex);
314	return (ssize_t) rc;	340	return (ssize_t) rc;
315	}	341	}
316	async_wait_for(req, &rc);	342	async_wait_for(req, &rc);
317	async_serialize_end();	343	async_serialize_end();
318	futex_up(&vfs_phone_futex);	344	futex_up(&vfs_phone_futex);
319	if (rc == EOK)	345	if (rc == EOK)
320	return (ssize_t) IPC_GET_ARG1(answer);	346	return (ssize_t) IPC_GET_ARG1(answer);
321	else	347	else
322	return -1;	348	return -1;
323	}	349	}
324		350
325	off_t lseek(int fildes, off_t offset, int whence)	351	off_t lseek(int fildes, off_t offset, int whence)
326	{	352	{
327	int res;	353	int res;
328	ipcarg_t rc;	354	ipcarg_t rc;
329		355
330	futex_down(&vfs_phone_futex);	356	futex_down(&vfs_phone_futex);
331	async_serialize_start();	357	async_serialize_start();
332	if (vfs_phone < 0) {	358	if (vfs_phone < 0) {
333	res = vfs_connect();	359	res = vfs_connect();
334	if (res < 0) {	360	if (res < 0) {
335	async_serialize_end();	361	async_serialize_end();
336	futex_up(&vfs_phone_futex);	362	futex_up(&vfs_phone_futex);
337	return res;	363	return res;
338	}	364	}
339	}	365	}
340		366
341	off_t newoffs;	367	off_t newoffs;
342	rc = async_req_3_1(vfs_phone, VFS_SEEK, fildes, offset, whence,	368	rc = async_req_3_1(vfs_phone, VFS_SEEK, fildes, offset, whence,
343	(ipcarg_t)&newoffs);	369	(ipcarg_t)&newoffs);
344		370
345	async_serialize_end();	371	async_serialize_end();
346	futex_up(&vfs_phone_futex);	372	futex_up(&vfs_phone_futex);
347		373
348	if (rc != EOK)	374	if (rc != EOK)
349	return (off_t) -1;	375	return (off_t) -1;
350		376
351	return newoffs;	377	return newoffs;
352	}	378	}
353		379
354	int ftruncate(int fildes, off_t length)	380	int ftruncate(int fildes, off_t length)
355	{	381	{
356	int res;	382	int res;
357	ipcarg_t rc;	383	ipcarg_t rc;
358		384
359	futex_down(&vfs_phone_futex);	385	futex_down(&vfs_phone_futex);
360	async_serialize_start();	386	async_serialize_start();
361	if (vfs_phone < 0) {	387	if (vfs_phone < 0) {
362	res = vfs_connect();	388	res = vfs_connect();
363	if (res < 0) {	389	if (res < 0) {
364	async_serialize_end();	390	async_serialize_end();
365	futex_up(&vfs_phone_futex);	391	futex_up(&vfs_phone_futex);
366	return res;	392	return res;
367	}	393	}
368	}	394	}
369	rc = async_req_2_0(vfs_phone, VFS_TRUNCATE, fildes, length);	395	rc = async_req_2_0(vfs_phone, VFS_TRUNCATE, fildes, length);
370	async_serialize_end();	396	async_serialize_end();
371	futex_up(&vfs_phone_futex);	397	futex_up(&vfs_phone_futex);
372	return (int) rc;	398	return (int) rc;
373	}	399	}
374		400
375	DIR opendir(const char dirname)	401	DIR opendir(const char dirname)
376	{	402	{
377	DIR *dirp = malloc(sizeof(DIR));	403	DIR *dirp = malloc(sizeof(DIR));
378	if (!dirp)	404	if (!dirp)
379	return NULL;	405	return NULL;
380	dirp->fd = _open(dirname, L_DIRECTORY, 0);	406	dirp->fd = _open(dirname, L_DIRECTORY, 0);
381	if (dirp->fd < 0) {	407	if (dirp->fd < 0) {
382	free(dirp);	408	free(dirp);
383	return NULL;	409	return NULL;
384	}	410	}
385	return dirp;	411	return dirp;
386	}	412	}
387		413
388	struct dirent readdir(DIR dirp)	414	struct dirent readdir(DIR dirp)
389	{	415	{
390	ssize_t len = read(dirp->fd, &dirp->res.d_name[0], NAME_MAX + 1);	416	ssize_t len = read(dirp->fd, &dirp->res.d_name[0], NAME_MAX + 1);
391	if (len <= 0)	417	if (len <= 0)
392	return NULL;	418	return NULL;
393	return &dirp->res;	419	return &dirp->res;
394	}	420	}
395		421
396	void rewinddir(DIR *dirp)	422	void rewinddir(DIR *dirp)
397	{	423	{
398	(void) lseek(dirp->fd, 0, SEEK_SET);	424	(void) lseek(dirp->fd, 0, SEEK_SET);
399	}	425	}
400		426
401	int closedir(DIR *dirp)	427	int closedir(DIR *dirp)
402	{	428	{
403	(void) close(dirp->fd);	429	(void) close(dirp->fd);
404	free(dirp);	430	free(dirp);
405	return 0;	431	return 0;
406	}	432	}
407		433
408	int mkdir(const char *path, mode_t mode)	434	int mkdir(const char *path, mode_t mode)
409	{	435	{
410	int res;	436	int res;
411	ipcarg_t rc;	437	ipcarg_t rc;
412	aid_t req;	438	aid_t req;
413		439
414	size_t pa_len;	440	size_t pa_len;
415	char *pa = absolutize(path, &pa_len);	441	char *pa = absolutize(path, &pa_len);
416	if (!pa)	442	if (!pa)
417	return ENOMEM;	443	return ENOMEM;
418		444
419	futex_down(&vfs_phone_futex);	445	futex_down(&vfs_phone_futex);
420	async_serialize_start();	446	async_serialize_start();
421	if (vfs_phone < 0) {	447	if (vfs_phone < 0) {
422	res = vfs_connect();	448	res = vfs_connect();
423	if (res < 0) {	449	if (res < 0) {
424	async_serialize_end();	450	async_serialize_end();
425	futex_up(&vfs_phone_futex);	451	futex_up(&vfs_phone_futex);
426	free(pa);	452	free(pa);
427	return res;	453	return res;
428	}	454	}
429	}	455	}
430	req = async_send_1(vfs_phone, VFS_MKDIR, mode, NULL);	456	req = async_send_1(vfs_phone, VFS_MKDIR, mode, NULL);
431	rc = ipc_data_write_start(vfs_phone, pa, pa_len);	457	rc = ipc_data_write_start(vfs_phone, pa, pa_len);
432	if (rc != EOK) {	458	if (rc != EOK) {
433	async_wait_for(req, NULL);	459	async_wait_for(req, NULL);
434	async_serialize_end();	460	async_serialize_end();
435	futex_up(&vfs_phone_futex);	461	futex_up(&vfs_phone_futex);
436	free(pa);	462	free(pa);
437	return (int) rc;	463	return (int) rc;
438	}	464	}
439	async_wait_for(req, &rc);	465	async_wait_for(req, &rc);
440	async_serialize_end();	466	async_serialize_end();
441	futex_up(&vfs_phone_futex);	467	futex_up(&vfs_phone_futex);
442	free(pa);	468	free(pa);
443	return rc;	469	return rc;
444	}	470	}
445		471
446	static int _unlink(const char *path, int lflag)	472	static int _unlink(const char *path, int lflag)
447	{	473	{
448	int res;	474	int res;
449	ipcarg_t rc;	475	ipcarg_t rc;
450	aid_t req;	476	aid_t req;
451		477
452	size_t pa_len;	478	size_t pa_len;
453	char *pa = absolutize(path, &pa_len);	479	char *pa = absolutize(path, &pa_len);
454	if (!pa)	480	if (!pa)
455	return ENOMEM;	481	return ENOMEM;
456		482
457	futex_down(&vfs_phone_futex);	483	futex_down(&vfs_phone_futex);
458	async_serialize_start();	484	async_serialize_start();
459	if (vfs_phone < 0) {	485	if (vfs_phone < 0) {
460	res = vfs_connect();	486	res = vfs_connect();
461	if (res < 0) {	487	if (res < 0) {
462	async_serialize_end();	488	async_serialize_end();
463	futex_up(&vfs_phone_futex);	489	futex_up(&vfs_phone_futex);
464	free(pa);	490	free(pa);
465	return res;	491	return res;
466	}	492	}
467	}	493	}
468	req = async_send_0(vfs_phone, VFS_UNLINK, NULL);	494	req = async_send_0(vfs_phone, VFS_UNLINK, NULL);
469	rc = ipc_data_write_start(vfs_phone, pa, pa_len);	495	rc = ipc_data_write_start(vfs_phone, pa, pa_len);
470	if (rc != EOK) {	496	if (rc != EOK) {
471	async_wait_for(req, NULL);	497	async_wait_for(req, NULL);
472	async_serialize_end();	498	async_serialize_end();
473	futex_up(&vfs_phone_futex);	499	futex_up(&vfs_phone_futex);

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(root)/branches/tracing/uspace/lib/libc/generic/vfs/vfs.c – Rev 3424 → 3425